mdw@git.distorted.org.uk Git - adns/blob - client/adnslogres.c

   1 /*
   2  * adnslogres.c
   3  * - a replacement for the Apache logresolve program using adns
   4  */
   5 /*
   6  *  This file is
   7  *   Copyright (C) 1999 Tony Finch <fanf@demon.net> <dot@dotat.at>
   8  *   Copyright (C) 1999 Ian Jackson <ian@davenant.greenend.org.uk>
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2, or (at your option)
  13  *  any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, write to the Free Software Foundation,
  22  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  *
  24  * This version was originally supplied by Tony Finch, but has been
  25  * modified by Ian Jackson as it was incorporated into adns.
  26  */
  27
  28 static const char * const cvsid =
  29         "$Id$";
  30
  31 #include <sys/types.h>
  32 #include <sys/time.h>
  33
  34 #include <unistd.h>
  35 #include <string.h>
  36 #include <stdlib.h>
  37 #include <stdio.h>
  38 #include <ctype.h>
  39 #include <errno.h>
  40
  41 #include "adns.h"
  42
  43 /* maximum number of concurrent DNS queries */
  44 #define MAXPENDING 1000
  45
  46 /* maximum length of a line */
  47 #define MAXLINE 1024
  48
  49 /* option flags */
  50 #define OPT_DEBUG 1
  51 #define OPT_POLL 2
  52
  53 static const char *progname;
  54
  55 static void aargh(const char *msg) {
  56   fprintf(stderr, "%s: %s: %s (%d)\n", progname, msg,
  57           strerror(errno) ? strerror(errno) : "Unknown error", errno);
  58   exit(1);
  59 }
  60
  61 /*
  62  * Parse the IP address and convert to a reverse domain name.
  63  */
  64 static char *ipaddr2domain(char *start, char **addr, char **rest) {
  65   static char buf[30]; /* "123.123.123.123.in-addr.arpa.\0" */
  66   char *ptrs[5];
  67   int i;
  68
  69   ptrs[0]= start;
  70 retry:
  71   while (!isdigit(*ptrs[0]))
  72     if (!*ptrs[0]++) {
  73       strcpy(buf, "invalid.");
  74       *addr= *rest= NULL;
  75       return buf;
  76     }
  77   for (i= 1; i < 5; i ++) {
  78     ptrs[i]= strchr(ptrs[i-1], (i == 4) ? ' ' : '.');
  79     if (!ptrs[i] || ptrs[i]-ptrs[i-1] > 3) {
  80       ptrs[0]++;
  81       goto retry;
  82     } else
  83       ptrs[i]++;
  84   }
  85   sprintf(buf, "%.*s.%.*s.%.*s.%.*s.in-addr.arpa.",
  86           ptrs[4]-ptrs[3]-1, ptrs[3],
  87           ptrs[3]-ptrs[2]-1, ptrs[2],
  88           ptrs[2]-ptrs[1]-1, ptrs[1],
  89           ptrs[1]-ptrs[0]-1, ptrs[0]);
  90   *addr= ptrs[0];
  91   *rest= ptrs[4]-1;
  92   return buf;
  93 }
  94
  95 static void printline(char *start, char *addr, char *rest, char *domain) {
  96   if (domain)
  97     printf("%.*s%s%s", addr - start, start, domain, rest);
  98   else
  99     fputs(start, stdout);
 100   if (ferror(stdout)) aargh("write output");
 101 }
 102
 103 typedef struct logline {
 104   struct logline *next;
 105   char *start, *addr, *rest;
 106   adns_query query;
 107 } logline;
 108
 109 static logline *readline(adns_state adns, int opts) {
 110   static char buf[MAXLINE];
 111   char *str;
 112   logline *line;
 113
 114   if (fgets(buf, MAXLINE, stdin)) {
 115     str= malloc(sizeof(*line) + strlen(buf) + 1);
 116     if (!str) aargh("malloc");
 117     line= (logline*)str;
 118     line->next= NULL;
 119     line->start= str+sizeof(logline);
 120     strcpy(line->start, buf);
 121     str = ipaddr2domain(line->start, &line->addr, &line->rest);
 122     if (opts & OPT_DEBUG)
 123         fprintf(stderr, "%s: adns_submit %s\n", progname, str);
 124     if (adns_submit(adns, str, adns_r_ptr,
 125                     adns_qf_quoteok_cname|adns_qf_cname_loose,
 126                     NULL, &line->query))
 127       aargh("adns_submit");
 128     return line;
 129   }
 130   if (!feof(stdin))
 131     aargh("fgets");
 132   return NULL;
 133 }
 134
 135 static void proclog(int opts) {
 136   int eof, err, len;
 137   adns_state adns;
 138   adns_answer *answer;
 139   logline *head, *tail, *line;
 140
 141   errno= adns_init(&adns, (opts & OPT_DEBUG) ? adns_if_debug : 0, 0);
 142   if (errno) aargh("adns_init");
 143   head= tail= readline(adns, opts);
 144   len= 1; eof= 0;
 145   while (head) {
 146     if (eof || len > MAXPENDING)
 147       if (opts & OPT_POLL)
 148         err= adns_wait_poll(adns, &head->query, &answer, NULL);
 149       else
 150         err= adns_wait(adns, &head->query, &answer, NULL);
 151     else
 152       err= adns_check(adns, &head->query, &answer, NULL);
 153     if (err != EWOULDBLOCK) {
 154         printline(head->start, head->addr, head->rest,
 155                   answer->status == adns_s_ok ? *answer->rrs.str : NULL);
 156         line= head; head= head->next;
 157         free(line); free(answer);
 158         len--;
 159     }
 160     if (!eof) {
 161       line= readline(adns, opts);
 162       if (!line)
 163         eof= 1;
 164       else {
 165         if (!head)
 166           head = line;
 167         else
 168           tail->next = line;
 169         tail = line;
 170         len++;
 171       }
 172     }
 173   }
 174   adns_finish(adns);
 175 }
 176
 177 int main(int argc, char *argv[]) {
 178   int c, opts;
 179
 180   progname= *argv;
 181   opts= 0;
 182
 183   while ((c= getopt(argc, argv, "dp")) != -1) {
 184     switch (c) {
 185     case 'd':
 186       opts |= OPT_DEBUG;
 187       break;
 188     case 'p':
 189       opts |= OPT_POLL;
 190       break;
 191     default:
 192       fprintf(stderr, "usage: %s [-d] < logfile\n", progname);
 193       exit(1);
 194     }
 195     argc-= optind;
 196     argv+= optind;
 197   }
 198
 199   proclog(opts);
 200
 201   if (fclose(stdout)) aargh("finish writing output");
 202   return 0;
 203 }